Really! I'm sorry forgiaro but you keep changing the parameters and to add that the "floor is old and yielding". This is feeling unsafe at any speed or belief in being able to do it or not...It's just not right and common sense should prevail.(the floor is old and yielding)
The difference between 200 & 500kg for a system like this is SIGNIFICANT and who is to say that it won't be overloaded at some point in time, probably because you have no way to be sure what a weight may be above the 200kg or between those extreme (Maximum) values.
I have made my recommendations for the vertical stanchion and how it should be attached with Strap Plates with no penetration of the concrete pillar. However with the "floor being OLD and Yielding" I no longer trust any of it to support such a system.
These are the Wrong Calculators for this type system! Plus I barely read Italian, even with Google Translate!
resting beam calculation with concentrated load
beam Calculation resting with evenly distributed load
I have never seen a 25mm bolt available in Metric fasteners (24mm or 26mm). Here are two links for everything you might want to know about Bolts, Grades, Tension & Shear...etc. Pins and shoulder bolts may be another way...
Shear, most important in your application...https://www.nucor-fastener.com/Files...r_Strength.pdf
General Tension, Grade properties (Take Note of the Modulus of Elasticity and what that means) and nut/bolt info...https://www.fastenal.com/content/doc...renceGuide.pdf
I do not believe Tapered roller bearings would be the right application for this.
Unfortunately, at this point I can no longer point you in any direction other than to find a Structural Engineer, Explain EXACTLY what you want and let him/her Design the system for you. If you build and/or install it is imperative that you follow the plans and mounting Exactly.